25145781656 has 32 divisors (see below), whose sum is σ = 47547796800. Its totient is φ = 12466599840.

The previous prime is 25145781653. The next prime is 25145781701. The reversal of 25145781656 is 65618754152.

It is a super-2 number, since 2×25145781656² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25145781653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 887891 + ... + 915773.

It is an arithmetic number, because the mean of its divisors is an integer number (1485868650).

Almost surely, 2^25145781656 is an apocalyptic number.

It is an amenable number.

25145781656 is a deficient number, since it is larger than the sum of its proper divisors (22402015144).

25145781656 is a wasteful number, since it uses less digits than its factorization.

25145781656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28839 (or 28835 counting only the distinct ones).

The product of its digits is 2016000, while the sum is 50.

The spelling of 25145781656 in words is "twenty-five billion, one hundred forty-five million, seven hundred eighty-one thousand, six hundred fifty-six".